Advisory ID: cisco-sa-20110601-phone
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110601-phone
Revision 1.0
For Public Release 2011 June 1 16:00 UTC (GMT)
Contents
Summary
Affected Products
Details
Vulnerability Scoring Details
Impact
Software Versions and Fixes
Workarounds
Obtaining Fixed Software
Exploitation and Public Announcements
Status of This Notice: Final
Distribution
Revision History
Cisco Security Procedures
Summary
Cisco Unified IP Phones 7900 Series devices, also known as TNP phones, are affected by three vulnerabilities that could allow an attacker to elevate privileges, change phone configurations, disclose sensitive information, or load unsigned software. These three vulnerabilities are classified as two privilege escalation vulnerabilities and one signature bypass vulnerability.
Cisco has released free software updates that address these vulnerabilities. There are no workarounds available to mitigate these vulnerabilities.
This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110601-phone.
Affected Products
Vulnerable Products
The following Cisco Unified IP Phone devices are affected:
- Cisco Unified IP Phone 7975G
- Cisco Unified IP Phone 7971G-GE
- Cisco Unified IP Phone 7970G
- Cisco Unified IP Phone 7965G
- Cisco Unified IP Phone 7962G
- Cisco Unified IP Phone 7961G
- Cisco Unified IP Phone 7961G-GE
- Cisco Unified IP Phone 7945G
- Cisco Unified IP Phone 7942G
- Cisco Unified IP Phone 7941G
- Cisco Unified IP Phone 7941G-GE
- Cisco Unified IP Phone 7931G
- Cisco Unified IP Phone 7911G
- Cisco Unified IP Phone 7906
The following models have reached end-of-life (EOL) status (for hardware only):
- Cisco Unified IP Phone 7971G-GE
- Cisco Unified IP Phone 7970G
- Cisco Unified IP Phone 7961G
- Cisco Unified IP Phone 7961G-GE
- Cisco Unified IP Phone 7941G
- Cisco Unified IP Phone 7941G-GE
- Cisco Unified IP Phone 7906
Refer to the following link to determine what product upgrade and substitution options are available:
http://www.cisco.com/en/US/products/hw/phones/ps379/prod_eol_notices_list.html
Products Confirmed Not Vulnerable
Details
Cisco Unified IP Phones 7900 Series devices are affected by two privilege escalation vulnerabilities and a signature bypass vulnerability. The following sections provide the details of each vulnerability addressed in this security advisory.
Privilege Escalation Vulnerabilities
Cisco Unified IP Phones 7900 Series devices are affected by two privilege escalation vulnerabilities that could allow an authenticated attacker to make unauthorized phone configuration changes or obtain potentially sensitive information.
These vulnerabilities are documented in Cisco bug IDs CSCtf07426 (registered customers only) and CSCtn65815 (registered customers only) and have been assigned Common Vulnerabilities and Exposures (CVE) identifiers CVE-2011-1602 and CVE-2011-1603 respectively.
Signature Verification Bypass Vulnerability
Cisco Unified IP Phones 7900 Series devices are affected by a signature verification bypass vulnerability that could allow an authenticated attacker to load a software image without verification of its signature.
This vulnerability is documented in Cisco bug ID CSCtn65962 (registered customers only) and has been assigned CVE identifier CVE-2011-1637
Vulnerability Scoring Details
Cisco has provided scores for the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this Security Advisory is done in accordance with CVSS version 2.0.
CVSS is a standards-based scoring method that conveys vulnerability severity and helps determine urgency and priority of response.
Cisco has provided a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.
Cisco has provided an FAQ to answer additional questions regarding CVSS at
http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html .
Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at
http://intellishield.cisco.com/security/alertmanager/cvss .
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CSCtf07426 - Privilege Escalation with "su" utility Calculate the environmental score of CSCtf07426 |
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CVSS Base Score - 6.6 |
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Access Vector |
Access Complexity |
Authentication |
Confidentiality Impact |
Integrity Impact |
Availability Impact |
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Local |
Medium |
Single |
Complete |
Complete |
Complete |
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CVSS Temporal Score - 5.5 |
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Exploitability |
Remediation Level |
Report Confidence |
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Functional |
Official-Fix |
Confirmed |
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CSCtn65815 - Privilege Escalation in IP Phones Calculate the environmental score of CSCtn65815 |
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|---|---|---|---|---|---|---|
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CVSS Base Score - 6.6 |
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Access Vector |
Access Complexity |
Authentication |
Confidentiality Impact |
Integrity Impact |
Availability Impact |
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|
Local |
Medium |
Single |
Complete |
Complete |
Complete |
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|
CVSS Temporal Score - 5.5 |
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|
Exploitability |
Remediation Level |
Report Confidence |
||||
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Functional |
Official-Fix |
Confirmed |
||||
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CSCtn65962 - Phones Permits the Installation of Unsigned Code Calculate the environmental score of CSCtn65962 |
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|---|---|---|---|---|---|---|
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CVSS Base Score - 1.5 |
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Access Vector |
Access Complexity |
Authentication |
Confidentiality Impact |
Integrity Impact |
Availability Impact |
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Local |
Medium |
Single |
Partial |
None |
None |
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CVSS Temporal Score - 1.2 |
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Exploitability |
Remediation Level |
Report Confidence |
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Functional |
Official-Fix |
Confirmed |
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Impact
Successful exploitation of the two privilege escalation vulnerabilities could allow an authenticated attacker to change phone configuration and obtain system information.
Successful exploitation of the signature verification bypass vulnerability that could allow an authenticated attacker to load and execute a software image without verification of its signature.
Software Versions and Fixes
When considering software upgrades, also consult http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution.
In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Technical Assistance Center (TAC) or your contracted maintenance provider for assistance.
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Vulnerability |
First Fixed Release |
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CSCtf07426 - Privilege Escalation with "su" utility |
9.0.3 |
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CSCtn65815 - Privilege Escalation in IP Phones |
9.2.1 |
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CSCtn65962 - Phones Permits the Installation of Unsigned Code |
9.2.1 |
Workarounds
Obtaining Fixed Software
Customers may only install and expect support for the feature sets they have purchased. By installing, downloading, accessing or otherwise using such software upgrades, customers agree to be bound by the terms of Cisco's software license terms found at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html , or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml .
Do not contact psirt@cisco.com or security-alert@cisco.com for software upgrades
Customers with Service Contracts
Customers Using Third-Party Support Organizations
The effectiveness of any workaround or fix is dependent on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Due to the variety of affected products and releases, customers should consult with their service provider or support organization to ensure any applied workaround or fix is the most appropriate for use in the intended network before it is deployed.
Customers Without Service Contracts
Customers who purchase direct from Cisco but do not hold a Cisco service contract, and customers who purchase through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should acquire upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC contacts are as follows.
- +1 800 553 2447 (toll free from within North America)
- +1 408 526 7209 (toll call from anywhere in the world)
- e-mail: tac@cisco.com
Customers should have their product serial number available and be prepared to give the URL of this notice as evidence of entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC.
Refer to http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, and instructions and e-mail addresses for use in various languages.
Exploitation and Public Announcements
The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory.
These vulnerabilities were discovered and reported to Cisco by Matt Duggan of Qualcomm.
Status of This Notice: Final
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.
Distribution
This advisory is posted on Cisco's worldwide website at:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110601-phone
In addition to worldwide web posting, a text version of this notice is clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail and Usenet news recipients.
- cust-security-announce@cisco.com
- first-teams@first.org
- bugtraq@securityfocus.com
- vulnwatch@vulnwatch.org
- cisco@spot.colorado.edu
- cisco-nsp@puck.nether.net
- full-disclosure@lists.grok.org.uk
- comp.dcom.sys.cisco@newsgate.cisco.com
Future updates of this advisory, if any, will be placed on Cisco's worldwide website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the above URL for any updates.
Revision History
|
Revision 1.0 |
2011-June-01 |
Initial public release. |
Cisco Security Procedures
Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html. This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at http://www.cisco.com/go/psirt.
